feat: feedback round 3 — content-type toggles, channel filter, card polish

- Content type is now three independent toggles (Normal / Shorts / Live·Upcoming);
  the feed is the union of enabled types (backend show_normal + include_shorts +
  include_live)
- Per-channel filter: a button on each card scopes the feed to that channel, shown
  as a removable chip in the sidebar
- Hide now refetches the feed once the change is persisted, so a hidden video shows
  up in the Hidden view immediately (no refresh needed); optimistic updates respect
  the current view
- Grid cards are now distinct panels (card background, border, shadow) that lift on
  hover; clickable channel name in list view too

backend/app/routes/feed.py

@@ -1,7 +1,7 @@
 from datetime import datetime, timezone
 
 from fastapi import APIRouter, Depends, HTTPException, Query
-from sqlalchemy import and_, func, or_, select
+from sqlalchemy import and_, false, func, or_, select
 from sqlalchemy.orm import Session, aliased
 
 from app.auth import current_user
@@ -50,6 +50,7 @@ def get_feed(
     min_duration: int | None = None,
     max_duration: int | None = None,
     max_age_days: int | None = None,
+    show_normal: bool = True,
     include_shorts: bool = False,
     include_live: bool = False,
     show: str = "unwatched",  # all | unwatched | watched | saved | hidden
@@ -92,13 +93,21 @@ def get_feed(
         )
     )
 
-    # In the explicit Watched/Saved/Hidden views, show the complete set regardless of
-    # the Shorts / live default-hiding (so e.g. a hidden Short still shows up there).
+    # Content-type filter: Normal (regular videos incl. past-stream VODs), Shorts and
+    # Live/Upcoming are independent toggles; the feed is the union of the enabled types.
+    # The explicit Watched/Saved/Hidden views show every type so nothing goes missing.
     explicit_view = show in ("watched", "saved", "hidden")
-    if not include_shorts and not explicit_view:
-        query = query.where(Video.is_short.is_(False))
-    if not include_live and not explicit_view:
-        query = query.where(Video.live_status.notin_(HIDDEN_LIVE))
+    if not explicit_view:
+        type_clauses = []
+        if show_normal:
+            type_clauses.append(
+                and_(Video.is_short.is_(False), Video.live_status.notin_(HIDDEN_LIVE))
+            )
+        if include_shorts:
+            type_clauses.append(Video.is_short.is_(True))
+        if include_live:
+            type_clauses.append(Video.live_status.in_(HIDDEN_LIVE))
+        query = query.where(or_(*type_clauses) if type_clauses else false())
     if channel_id:
         query = query.where(Video.channel_id == channel_id)
     if min_duration is not None: